Is RAG1 p.Arg778= (c.2332C>A) pathogenic?

RAG1 p.Arg778= (c.2332C>A) is classified Likely benign in RAG1 (ClinVar, Single submitter, 1 submitter; last evaluated 2024-04-10). Very rare (popmax 0.00167%, amr); Associated with severe combined immunodeficiency, autosomal recessive, T cell-negative, B cell-negative, NK cell-positive.

How common is RAG1 p.Arg778= (c.2332C>A) in the general population?

RAG1 p.Arg778= (c.2332C>A) is very rare (popmax 0.00167%, amr) (gnomAD).

RAG1 p.Arg778=

Q: What condition is associated with RAG1 p.Arg778= (c.2332C>A)?

RAG1 p.Arg778= (c.2332C>A) is associated with severe combined immunodeficiency, autosomal recessive, T cell-negative, B cell-negative, NK cell-positive, combined immunodeficiency with skin granulomas (ClinVar).

Q: How is Severe combined immunodeficiency due to complete RAG1/2 deficiency inherited?

Typically Autosomal recessive (Orphanet). A genetic counselor can assess individual risk for a family.

c.2332C>A · rs752020152 · VCV2937729

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00167%, amr)

Conditions

severe combined immunodeficiency, autosomal recessive, T cell-negative, B cell-negative, NK cell-positive

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 2.3	GERP 2.1, phastCons 0.98
Overall
CADD	15.94	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00167% Admixed American · 1/60,006 alleles

Filtering AF 0.000124% ClinGen BA1/BS1 input FAF95, joint · FAF99 9e-05%

Overall 0.000372% 6/1,614,066 alleles · very rare

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.00167%	60,006
European (non-Finnish)	0.000424%	236,006

Rarity supports pathogenicity (ACMG PM2); frequency above a disease-specific BA1/BS1 threshold argues against it. A variant frequent in one ancestry group can be near-absent in others, so a single global figure can mislead.

Variant & gene context

Gene: RAG1
Protein: p.Arg778=
Coding: c.2332C>A
MANE Select: NM_000448
dbSNP: rs752020152
Type: single nucleotide variant
Location: chr11:36575636 (GRCh38)
Gene constraint: LOEUF 0.703 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 81.68
Residue 778: a UniProt-annotated variant site (in t(-)b(-)nk(+) scid; uncertain significance); a UniProt-annotated variant site (in chidg; reduced recombination activity)

Full RAG1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

severe combined immunodeficiency, autosomal recessive, T cell-negative, B cell-negative, NK cell-positive — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: combined immunodeficiency with skin granulomas

For Severe combined immunodeficiency due to complete RAG1/2 deficiency (Orphanet):

Inheritance: Autosomal recessive
Onset: Infancy
Prevalence: 1-9 / 100 000 (Europe)

Similar variants

RAG1 p.Arg778Gln Pathogenic ★★ same residue
RAG1 p.Arg778Trp Pathogenic ★★ same residue
RAG1 p.Ala444Val Pathogenic ★★★ same condition
RAG1 p.Arg108Ter Pathogenic ★★★ same condition
RAG1 p.Arg142Ter Pathogenic ★★★ same condition
RAG1 p.Arg394Gln Likely pathogenic ★★★ same condition
RAG1 p.Arg394Trp Pathogenic ★★★ same condition
RAG1 p.Arg396His Pathogenic ★★★ same condition

Built on 18 open, versioned datasets — ClinVar, gnomAD, AlphaMissense, REVEL, ClinGen & more — plus Sugi Variant's own cross-source analysis. Source data 2026-01–2026-10, ClinVar 2026-10. Full sources & versions →

Cite Sugi Variant

Gür T. Sugi Variant: A Deterministic Per-Variant Germline Reference from a Knowledge Graph for Humans and AI Agents. 2026. doi:10.5281/zenodo.21509445. This variant: https://sugi.bio/variant/rag1-p-arg778 (accessed [today's date]).

Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown